Electrochemical and Photoelectrochemical Processes for Water Splitting

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalysis for Sustainable Energy".

Deadline for manuscript submissions: closed (20 November 2024) | Viewed by 1474

Special Issue Editors


E-Mail Website1 Website2 Website3
Guest Editor
1. Chemistry Department, Faculty of Science, Benha University, Benha 13511, Egypt
2. Egypt-Japan University of Science and Technology, Borg El Arab, Alexandria 21934, Egypt
Interests: nanocatalysis; photocatalysis for water remediation; energy transfer; dye-sensitized solar cell; energy storage; supercapacitors; sensors; fuel cells

E-Mail Website
Guest Editor
Graphene Center of Excellence, Egypt-Japan University of Science and Technology, Borg El Arab, Alexandria 21934, Egypt
Interests: catalysis for direct water electrolysis; heterogeneous catalysis for CO2 conversion and storage; wearable and printed devices based on graphene for energy storage and sensing applications

Special Issue Information

Dear Colleagues,

Generating hydrogen sustainably through water splitting using photocatalytic, electrocatalytic, and synergistic photo-electrocatalytic processes is a successful approach for tackling the energy problem. The substantial recombination of photo-generated charges, the high overpotential, the slow rate of the surface reaction, and the oxygen-forming oxidation process all contribute to restricting the effectiveness of the photo- and electrocatalytic splitting of water. The search for inexpensive nano-metal oxides to produce hydrogen from water has been particularly targeted because of the rarity of precious catalysts, the difficulties they encounter while functioning, their expensive nature, and their inability to be applied on a large scale. Metal oxides are strong contenders, especially if they are well-synthesized and feature a large surface area, quick-charging transport, many active sites, and the large transport of ions. To give readers a thorough understanding of the state of the study area at this moment in time, this subject is devoted to both the fundamental and applied aspects of photo- and electrocatalysis. This is anticipated to assist in closing the gap between the most basic understanding of heterojunction photo- and electrocatalytic systems and the creation of hydrogen-generating applications based on practical implementations, paving the way for new technologies and opportunities for the future elimination of the mentioned obstacles.

Prof. Dr. Mohamed Mokhtar Mohamed
Prof. Dr. Ahmed Abd El-Moneim
Guest Editors

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Keywords

  • water splitting using carbon-based electrodes
  • aspects of PEC water splitting’s thermodynamics and computational approach
  • PEC water splitting working concept
  • developing semiconductors HER catalysts
  • metal oxide-based catalysts for HER catalysts
  • Pt-free photo- and electrocatalyst-based HER
  • bimetallic metals for photo- and electrocatalysis for water splitting
  • employing polymers as photo(electrocatalysts)
  • techno-economic feasibility of hydrogen production
  • hardware of PEM and alkaline electrolyzers
  • photochemical approach for hydrogen evolution

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Published Papers (1 paper)

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Research

21 pages, 4751 KiB  
Article
Green Synthesis of LaMnO3-Ag Nanocomposites Using Citrus limon (L.) Burm Peel Aqueous Extract: Photocatalytic Degradation of Rose Bengal Dye and Antibacterial Applications
by Nazim Hasan
Catalysts 2024, 14(9), 609; https://doi.org/10.3390/catal14090609 - 11 Sep 2024
Viewed by 983
Abstract
Perovskites can absorb solar energy and are extensively used in various catalytic and photocatalytic reactions. However, noble metal particles may enhance the catalytic, photocatalytic, and antibacterial activities. This study demonstrates the cost-effective green synthesis of the photocatalyst perovskite LaMnO3 and its modification [...] Read more.
Perovskites can absorb solar energy and are extensively used in various catalytic and photocatalytic reactions. However, noble metal particles may enhance the catalytic, photocatalytic, and antibacterial activities. This study demonstrates the cost-effective green synthesis of the photocatalyst perovskite LaMnO3 and its modification with noble metal Ag nanoparticles. The green synthesis of nanocomposite was achieved through a hydrothermal method employing aqueous extract derived from Citrus limon (L.) Burm peels. The properties of fabricated perovskites LaMnO3 and LaMnO3-Ag nanocomposites were evaluated and characterized by Ultraviolet-Visible spectroscopy (UV-Vis), Diffuse Reflectance Spectroscopy (DRS), X-ray diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FT-IR), High-Resolution Transmission Electron Microscopy (HRTEM), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) surface area techniques. The particle size distribution % of LaMnO3 and LaMnO3-Ag was observed to be 20 to 60 nm after using TEM images. The maximum percentage size distribution was 37 nm for LaMnO3 and 43 nm for LaMnO3-Ag. In addition, LaMnO3-Ag nanocomposite was utilized as a photocatalyst for the degradation of Rose Bengal (RB) dye and its antibacterial activities against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). The surface area and band gap for perovskite LaMnO3 nanoparticles were calculated as 12.642 m2/g and 3.44 eV, respectively. The presence of noble metal and hydrothermal-bio reduction significantly impacted the crystallinity. The BET surface area was found to be 16.209 m2/g, and band gap energy was calculated at 2.94 eV. The LaMnO3 nanocomposite with noble metal shows enhanced photocatalytic effectiveness against RB dye (20 PPM) degradation (92%, R2 = 0.995) with pseudo-first-order chemical kinetics (rate constant, k = 0.05057 min−1) within 50 min due to the ultimate combination of the hydrothermal and bio-reduction technique. The photocatalytic activity of the LaMnO3-Ag nanocomposite was optimized at different reaction times, photocatalyst doses (0.2, 0.4, 0.6, and 0.8 g/L), and various RB dye concentrations (20, 30, 40, and 50 ppm). The antibacterial activities of green synthesized LaMnO3 and LaMnO3-Ag nanoparticles were explored based on colony-forming unit (cfu) reduction and TEM images of bacterial and nanoparticle interactions for S. aureus and E. coli. An amount of 50 µg/mL LaMnO3-Ag nanocomposite was sufficient to work as the highest antibacterial activity for both bacteria. The perovskite LaMnO3-Ag nanocomposite synthesis process is economically and environmentally friendly. Additionally, it has a wide range of effective and exclusive applications for remediating pollutants. Full article
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